ln -s /Users/fengqilin/AndroidStudioProjects/MyApplication/project/src/main/java /Users/fengqilin/AndroidStudioProjects/MyApplication/project1/src/main/java
ln -s /Users/fengqilin/AndroidStudioProjects/MyApplication/project/src/main/java /Users/fengqilin/AndroidStudioProjects/MyApplication/project31/src/main/java